Compilare: user.cpp: In constructor ‘interval::interval(int, int, SI)’: user.cpp:14:12: warning: ‘interval::r’ will be initialized after [-Wreorder] int l, r; ^ user.cpp:13:8: warning: ‘SI interval::el’ [-Wreorder] SI el; ^ user.cpp:15:5: warning: when initialized here [-Wreorder] interval(int l, int r, SI el = SI()) : l(l), r(r), el(el) {} ^ user.cpp: In function ‘void do_test()’: user.cpp:32:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < diediedie.size(); i++) ^ user.cpp:71:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (Sets[pos]->el.size() == val && len > best) ^ user.cpp:29:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &N); ^ user.cpp:41:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &x); ^ user.cpp: In function ‘int main()’: user.cpp:80:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("unique.in", "rt", stdin); ^ user.cpp:81:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("unique.out", "wt", stdout); ^ user.cpp:82:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (scanf ("%d", &T); T--;) ^